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* MFC r196205:Konstantin Belousov2009-08-141-15/+12
| | | | | | | | | | | In nfs_upgrade_vnlock(), assert that the vnode is locked. When downgrading, pass LK_RETRY to the vn_lock(), since otherwise vn_lock() unlocks the doomed vnode, causing extra unlock. Approved by: re (rwatson) Notes: svn path=/stable/8/; revision=196209
* Remove the old kernel RPC implementation and the NFS_LEGACYRPC option.Doug Rabson2009-06-301-108/+0
| | | | | | | Approved by: re Notes: svn path=/head/; revision=195202
* Remove the unmaintained University of Michigan NFSv4 client from 8.xRobert Watson2009-05-221-2/+0
| | | | | | | | | | prior to 8.0-RELEASE. Rick Macklem's new and more feature-rich NFSv234 client and server are replacing it. Discussed with: rmacklem Notes: svn path=/head/; revision=192578
* When a stale file handle is encountered, purge all cached information aboutJohn Baldwin2009-04-061-0/+23
| | | | | | | | | | | | | | an NFS node including the access and attribute caches. Previously the NFS client only purged any name cache entries associated with the file. PR: kern/123755 Submitted by: Jaakko Heinonen jh of saunalahti fi Reported by: Timo Sirainen tss of iki fi Reviewed by: rwatson, rmacklem MFC after: 1 month Notes: svn path=/head/; revision=190785
* Fix two bugs in DTrace tracing of accesscache and attrcache load events:Robert Watson2009-03-241-4/+8
| | | | | | | | | | | | | | - Trace non-error loads into the access cache once, not zero times or twice. - Sometimes attr cache loads fail due to a race, in which case they are aborted leading to an invalidation; in this case, trace only the flush, not a load. MFC after: 1 month Sponsored by: Google, Inc. Notes: svn path=/head/; revision=190396
* Add DTrace probes to the NFS access and attribute caches. Access cacheRobert Watson2009-03-241-6/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | events are: nfsclient:accesscache:flush:done nfsclient:accesscache:get:hit nfsclient:accesscache:get:miss nfsclient:accesscache:load:done They pass the vnode, uid, and requested or loaded access mode (if any); the load event may also report a load error if the RPC fails. The attribute cache events are: nfsclient:attrcache:flush:done nfsclient:attrcache:get:hit nfsclient:attrcache:get:miss nfsclient:attrcache:load:done They pass the vnode, optionally the vattr if one is present (hit or load), and in the case of a load event, also a possible RPC error. MFC after: 1 month Sponsored by: Google, Inc. Notes: svn path=/head/; revision=190380
* Implement support for RPCSEC_GSS authentication to both the NFS clientDoug Rabson2008-11-031-1/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | and server. This replaces the RPC implementation of the NFS client and server with the newer RPC implementation originally developed (actually ported from the userland sunrpc code) to support the NFS Lock Manager. I have tested this code extensively and I believe it is stable and that performance is at least equal to the legacy RPC implementation. The NFS code currently contains support for both the new RPC implementation and the older legacy implementation inherited from the original NFS codebase. The default is to use the new implementation - add the NFS_LEGACYRPC option to fall back to the old code. When I merge this support back to RELENG_7, I will probably change this so that users have to 'opt in' to get the new code. To use RPCSEC_GSS on either client or server, you must build a kernel which includes the KGSSAPI option and the crypto device. On the userland side, you must build at least a new libc, mountd, mount_nfs and gssd. You must install new versions of /etc/rc.d/gssd and /etc/rc.d/nfsd and add 'gssd_enable=YES' to /etc/rc.conf. As long as gssd is running, you should be able to mount an NFS filesystem from a server that requires RPCSEC_GSS authentication. The mount itself can happen without any kerberos credentials but all access to the filesystem will be denied unless the accessing user has a valid ticket file in the standard place (/tmp/krb5cc_<uid>). There is currently no support for situations where the ticket file is in a different place, such as when the user logged in via SSH and has delegated credentials from that login. This restriction is also present in Solaris and Linux. In theory, we could improve this in future, possibly using Brooks Davis' implementation of variant symlinks. Supporting RPCSEC_GSS on a server is nearly as simple. You must create service creds for the server in the form 'nfs/<fqdn>@<REALM>' and install them in /etc/krb5.keytab. The standard heimdal utility ktutil makes this fairly easy. After the service creds have been created, you can add a '-sec=krb5' option to /etc/exports and restart both mountd and nfsd. The only other difference an administrator should notice is that nfsd doesn't fork to create service threads any more. In normal operation, there will be two nfsd processes, one in userland waiting for TCP connections and one in the kernel handling requests. The latter process will create as many kthreads as required - these should be visible via 'top -H'. The code has some support for varying the number of service threads according to load but initially at least, nfsd uses a fixed number of threads according to the value supplied to its '-n' option. Sponsored by: Isilon Systems MFC after: 1 month Notes: svn path=/head/; revision=184588
* Document a few sysctls in the NFS client and server code.Tom Rhodes2008-11-021-1/+2
| | | | | | | | | Minor style(9) where applicable. Approved by: alfred (slightly older version) Notes: svn path=/head/; revision=184561
* Retire the MALLOC and FREE macros. They are an abomination unto style(9).Dag-Erling Smørgrav2008-10-231-2/+2
| | | | | | | MFC after: 3 months Notes: svn path=/head/; revision=184205
* Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT.Ruslan Ermilov2008-03-251-10/+10
| | | | | | | | | | | | | Removed dead code that assumed that M_TRYWAIT can return NULL; it's not true since the advent of MBUMA. Reviewed by: arch There are ongoing disputes as to whether we want to switch to directly using UMA flags M_WAITOK/M_NOWAIT for mbuf(9) allocation. Notes: svn path=/head/; revision=177599
* - Complete part of the unfinished bufobj work by consistently usingJeff Roberson2008-03-221-5/+8
| | | | | | | | | | | | | | | | | | | | BO_LOCK/UNLOCK/MTX when manipulating the bufobj. - Create a new lock in the bufobj to lock bufobj fields independently. This leaves the vnode interlock as an 'identity' lock while the bufobj is an io lock. The bufobj lock is ordered before the vnode interlock and also before the mnt ilock. - Exploit this new lock order to simplify softdep_check_suspend(). - A few sync related functions are marked with a new XXX to note that we may not properly interlock against a non-zero bv_cnt when attempting to sync all vnodes on a mountlist. I do not believe this race is important. If I'm wrong this will make these locations easier to find. Reviewed by: kib (earlier diff) Tested by: kris, pho (earlier diff) Notes: svn path=/head/; revision=177493
* Axe the 'thread' argument from VOP_ISLOCKED() and lockstatus() as it isAttilio Rao2008-02-251-1/+1
| | | | | | | | | | | | always curthread. As KPI gets broken by this patch, manpages and __FreeBSD_version will be updated by further commits. Tested by: Andrea Barberio <insomniac at slackware dot it> Notes: svn path=/head/; revision=176559
* Consolidate the code to generate a new XID for a NFS request into aJohn Baldwin2008-02-131-14/+23
| | | | | | | | | | | nfs_xid_gen() function instead of duplicating the logic in both nfsm_rpchead() and the NFS3ERR_JUKEBOX handling in nfs_request(). MFC after: 1 week Submitted by: mohans (a long while ago) Notes: svn path=/head/; revision=176224
* namei() can call underlying nfs_readlink() passing a struct uio pointerAttilio Rao2008-02-091-3/+3
| | | | | | | | | | | | | | | | | owned by a NULL owner. This will lead consequent VOP_ISLOCKED() present into nfs_upgrade_vnlock() to panic as it only acquire curthread now. Fix nfs_upgrade_vnlock() and nfs_downgrade_vnlock() in order to not use more the struct thread pointer passed as argument (as it is really nomore required there as vn_lock() and VOP_UNLOCK doesn't get the lock more). Using curthread, in place, doesn't get ambiguity as LK_EXCLOTHER should be handled as a "not locked" request by both functions. Reported by: kris Tested by: kris Reviewed by: ups Notes: svn path=/head/; revision=176134
* - Introduce the function lockmgr_recursed() which returns true if theAttilio Rao2008-01-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | lockmgr lkp, when held in exclusive mode, is recursed - Introduce the function BUF_RECURSED() which does the same for bufobj locks based on the top of lockmgr_recursed() - Introduce the function BUF_ISLOCKED() which works like the counterpart VOP_ISLOCKED(9), showing the state of lockmgr linked with the bufobj BUF_RECURSED() and BUF_ISLOCKED() entirely replace the usage of bogus BUF_REFCNT() in a more explicative and SMP-compliant way. This allows us to axe out BUF_REFCNT() and leaving the function lockcount() totally unused in our stock kernel. Further commits will axe lockcount() as well as part of lockmgr() cleanup. KPI results, obviously, broken so further commits will update manpages and freebsd version. Tested by: kris (on UFS and NFS) Notes: svn path=/head/; revision=175486
* VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used inAttilio Rao2008-01-131-1/+1
| | | | | | | | | | | | | | conjuction with 'thread' argument passing which is always curthread. Remove the unuseful extra-argument and pass explicitly curthread to lower layer functions, when necessary. KPI results broken by this change, which should affect several ports, so version bumping and manpage update will be further committed. Tested by: kris, pho, Diego Sardina <siarodx at gmail dot com> Notes: svn path=/head/; revision=175294
* vn_lock() is currently only used with the 'curthread' passed as argument.Attilio Rao2008-01-101-3/+3
| | | | | | | | | | | | | | | | | | | Remove this argument and pass curthread directly to underlying VOP_LOCK1() VFS method. This modify makes the code cleaner and in particular remove an annoying dependence helping next lockmgr() cleanup. KPI results, obviously, changed. Manpage and FreeBSD_version will be updated through further commits. As a side note, would be valuable to say that next commits will address a similar cleanup about VFS methods, in particular vop_lock1 and vop_unlock. Tested by: Diego Sardina <siarodx at gmail dot com>, Andrea Di Pasquale <whyx dot it at gmail dot com> Notes: svn path=/head/; revision=175202
* NFS MP scaling changes.Mohan Srinivasan2007-10-121-2/+4
| | | | | | | | | | | | | | | | | - Eliminate the hideous nfs_sndlock that serialized NFS/TCP request senders thru the sndlock. - Institute a new nfs_connectlock that serializes NFS/TCP reconnects. Add logic to wait for pending request senders to finish sending before reconnecting. Dial down the sb_timeo for NFS/TCP sockets to 1 sec. - Break out the nfs xid manipulation under a new nfs xid lock, rather than over loading the nfs request lock for this purpose. - Fix some of the locking in nfs_request. Many thanks to Kris Kennaway for his help with this and for initiating the MP scaling analysis and work. Kris also tested this patch thorougly. Approved by: re@ (Ken Smith) Notes: svn path=/head/; revision=172600
* Fix for a race where out of order loading of NFS attrs into theJohn Baldwin2007-07-031-1/+17
| | | | | | | | | | | | | | | nfsnode could lead to attrs being stale. One example (that we ran into) was a READDIR+, WRITE. The responses came back in order, but the attrs from the WRITE were loaded before the attrs from the READDIR+, leading to the wrong size from being read on the next stat() call. MFC after: 1 week Submitted by: mohans Approved by: re (kensmith) Notes: svn path=/head/; revision=171190
* Over NFS, an open() call could result in multiple over-the-wireMohan Srinivasan2007-03-091-0/+9
| | | | | | | | | | | | | | | GETATTRs being generated - one from lookup()/namei() and the other from nfs_open() (for cto consistency). This change eliminates the GETATTR in nfs_open() if an otw GETATTR was done from the namei() path. Instead of extending the vop interface, we timestamp each attr load, and use this to detect whether a GETATTR was done from namei() for this syscall. Introduces a thread-local variable that counts the syscalls made by the thread and uses <pid, tid, thread syscalls> as the attrload timestamp. Thanks to jhb@ and peter@ for a discussion on thread state that could be used as the timestamp with minimal overhead. Notes: svn path=/head/; revision=167352
* Fixes up the handling of shared vnode lock lookups in the NFS client,Mohan Srinivasan2006-09-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | adds a FS type specific flag indicating that the FS supports shared vnode lock lookups, adds some logic in vfs_lookup.c to test this flag and set lock flags appropriately. - amd on 6.x is a non-starter (without this change). Using amd under heavy load results in a deadlock (with cascading vnode locks all the way to the root) very quickly. - This change should also fix the more general problem of cascading vnode deadlocks when an NFS server goes down. Ideally, we wouldn't need these changes, as enabling shared vnode lock lookups globally would work. Unfortunately, UFS, for example isn't ready for shared vnode lock lookups, crashing pretty quickly. This change is the result of discussions with Stephan Uphoff (ups@). Reviewed by: ups@ Notes: svn path=/head/; revision=162288
* Changes to make the NFS client MP safe.Mohan Srinivasan2006-05-191-24/+108
| | | | | | | Thanks to Kris Kennaway for testing and sending lots of bugs my way. Notes: svn path=/head/; revision=158739
* fix a problem with XID re-use when a server returns NFSERR_JUKEBOX.Jim Rees2005-11-211-3/+4
| | | | | | | | | | Submitted by: cel@citi.umich.edu Fixed by: rick@snowhite.cis.uoguelph.ca Approved by: alfred MFC after: 3 weeks Notes: svn path=/head/; revision=152652
* Make nfs_timer() MPSAFE. With this change, the bottom half of the NFSPaul Saab2005-07-191-1/+1
| | | | | | | | | | client (the interface with the protocol stack and callouts) is Giant-free. Submitted by: Mohan Srinivasan. Notes: svn path=/head/; revision=148162
* - The VI_DOOMED flag now signals the end of a vnode's relationship withJeff Roberson2005-03-131-1/+1
| | | | | | | | | the filesystem. Check that rather than VI_XLOCK. Sponsored by: Isilon Systems, Inc. Notes: svn path=/head/; revision=143510
* /* -> /*- for license, minor formatting changesWarner Losh2005-01-071-1/+1
| | | | Notes: svn path=/head/; revision=139823
* Rewrite of the NFS client's reply handling. We now have NFS socketPaul Saab2004-12-061-0/+4
| | | | | | | | | | | upcalls which do RPC header parsing and match up the reply with the request. NFS calls now sleep on the nfsreq structure. This enables us to eliminate the NFS recvlock. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com Notes: svn path=/head/; revision=138496
* 2 fixes that improve on the consistency of the NFS client cache.Paul Saab2004-12-061-4/+4
| | | | | | | | | | | | | | - Change the cached mtime to a 'struct timespec' from a time_t. Improving the precision of the cached mtime tightens up NFS' "close-to-open" consistency considerably. - Always force an over-the-wire consistency check from nfs_open() (unless the file is marked modified). This further improves NFS' "close-to-open" consistency. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com Notes: svn path=/head/; revision=138473
* Add non-blocking versions of nfsm_dissect() and friends, for use fromPaul Saab2004-12-061-1/+1
| | | | | | | | | | | | socket callbacks or similar callers, from both the NFS client and the server. Instituted nfsm_dissect_nonblock(), nfsm_dissect_xx_nonblock(). And nfsm_disct() now takes an extra M_TRYWAIT/M_DONTWAIT argument. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com Notes: svn path=/head/; revision=138463
* For reasons unknown, the nfs locking code used a fifo to send requests toPoul-Henning Kamp2004-12-061-10/+0
| | | | | | | | | | | | | | | | userland and a dedicated system call to get replies. The vnode-bypass of fifos broke this into a panic. Ditch all the magic and create a device /dev/nfslock instead, and use that for both directions apart from the shorter path, this is also faster because the device driver runs Giant free using the vnode bypass. Noticed by: marcel Notes: svn path=/head/; revision=138430
* Back when VOP_* was introduced, we did not have new-style structPoul-Henning Kamp2004-12-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | initializations but we did have lofty goals and big ideals. Adjust to more contemporary circumstances and gain type checking. Replace the entire vop_t frobbing thing with properly typed structures. The only casualty is that we can not add a new VOP_ method with a loadable module. History has not given us reason to belive this would ever be feasible in the the first place. Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc. Give coda correct prototypes and function definitions for all vop_()s. Generate a bit more data from the vnode_if.src file: a struct vop_vector and protype typedefs for all vop methods. Add a new vop_bypass() and make vop_default be a pointer to another struct vop_vector. Remove a lot of vfs_init since vop_vector is ready to use from the compiler. Cast various vop_mumble() to void * with uppercase name, for instance VOP_PANIC, VOP_NULL etc. Implement VCALL() by making vdesc_offset the offsetof() the relevant function pointer in vop_vector. This is disgusting but since the code is generated by a script comparatively safe. The alternative for nullfs etc. would be much worse. Fix up all vnode method vectors to remove casts so they become typesafe. (The bulk of this is generated by scripts) Notes: svn path=/head/; revision=138290
* Add b_bufobj to struct buf which eventually will eliminate the need for b_vp.Poul-Henning Kamp2004-10-221-2/+1
| | | | | | | | | | | | | | | | | | | | | Initialize b_bufobj for all buffers. Make incore() and gbincore() take a bufobj instead of a vnode. Make inmem() local to vfs_bio.c Change a lot of VI_[UN]LOCK(bp->b_vp) to BO_[UN]LOCK(bp->b_bufobj) also VI_MTX() to BO_MTX(), Make buf_vlist_add() take a bufobj instead of a vnode. Eliminate other uses of bp->b_vp where bp->b_bufobj will do. Various minor polishing: remove "register", turn panic into KASSERT, use new function declarations, TAILQ_FOREACH_SAFE() etc. Notes: svn path=/head/; revision=136767
* Move the VI_BWAIT flag into no bo_flag element of bufobj and call it BO_WWAITPoul-Henning Kamp2004-10-211-1/+1
| | | | | | | | | | | | | Add bufobj_wref(), bufobj_wdrop() and bufobj_wwait() to handle the write count on a bufobj. Bufobj_wdrop() replaces vwakeup(). Use these functions all relevant places except in ffs_softdep.c where the use if interlocked_sleep() makes this impossible. Rename b_vnbufs to b_bobufs now that we touch all the relevant files anyway. Notes: svn path=/head/; revision=136751
* Remove support for using NFS device nodes.Poul-Henning Kamp2004-09-281-7/+0
| | | | Notes: svn path=/head/; revision=135874
* When we traverse the vnodes on a mountpoint we need to look out forPoul-Henning Kamp2004-07-041-5/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | our cached 'next vnode' being removed from this mountpoint. If we find that it was recycled, we restart our traversal from the start of the list. Code to do that is in all local disk filesystems (and a few other places) and looks roughly like this: MNT_ILOCK(mp); loop: for (vp = TAILQ_FIRST(&mp...); (vp = nvp) != NULL; nvp = TAILQ_NEXT(vp,...)) { if (vp->v_mount != mp) goto loop; MNT_IUNLOCK(mp); ... MNT_ILOCK(mp); } MNT_IUNLOCK(mp); The code which takes vnodes off a mountpoint looks like this: MNT_ILOCK(vp->v_mount); ... TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes); ... MNT_IUNLOCK(vp->v_mount); ... vp->v_mount = something; (Take a moment and try to spot the locking error before you read on.) On a SMP system, one CPU could have removed nvp from our mountlist but not yet gotten to assign a new value to vp->v_mount while another CPU simultaneously get to the top of the traversal loop where it finds that (vp->v_mount != mp) is not true despite the fact that the vnode has indeed been removed from our mountpoint. Fix: Introduce the macro MNT_VNODE_FOREACH() to traverse the list of vnodes on a mountpoint while taking into account that vnodes may be removed from the list as we go. This saves approx 65 lines of duplicated code. Split the insmntque() which potentially moves a vnode from one mount point to another into delmntque() and insmntque() which does just what the names say. Fix delmntque() to set vp->v_mount to NULL while holding the mountpoint lock. Notes: svn path=/head/; revision=131551
* Second half of the dev_t cleanup.Poul-Henning Kamp2004-06-171-1/+1
| | | | | | | | | | | | | | The big lines are: NODEV -> NULL NOUDEV -> NODEV udev_t -> dev_t udev2dev() -> findcdev() Various minor adjustments including handling of userland access to kernel space struct cdev etc. Notes: svn path=/head/; revision=130640
* Let the NFS client notice a file's size changing as a modification.Peter Edwards2004-04-141-2/+9
| | | | | | | | | | | | This avoids presenting invalid data to the client's applications when the file is modified, and then extended within the window of the resolution of the modifcation timestamp. Reviewed By: iedowse PR: kern/64091 Notes: svn path=/head/; revision=128263
* Unbreak build: s/TAILQ_ISEMPTY/TAILQ_EMPTY/gMarcel Moolenaar2004-04-111-1/+1
| | | | Notes: svn path=/head/; revision=128126
* Clean up properly when unloading NFS client module.Peter Edwards2004-04-111-0/+19
| | | | | | | | | | | | This includes a modified form of some code from Thomas Moestl (tmm@) to properly clean up the UMA zone and the "nfsnodehashtbl" hash table. Reviewed By: iedowse PR: 16299 Notes: svn path=/head/; revision=128111
* Remove advertising clause from University of California Regent'sWarner Losh2004-04-071-4/+0
| | | | | | | | | | license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson Notes: svn path=/head/; revision=127977
* only do nfs rpc callouts if there is work to do.Jim Rees2004-03-251-3/+2
| | | | | | | | Submitted by: kan Approved by: alfred Notes: svn path=/head/; revision=127421
* Remove unused second arg to vfinddev().Poul-Henning Kamp2004-03-111-3/+4
| | | | | | | Don't call addaliasu() on VBLK nodes. Notes: svn path=/head/; revision=126851
* Use function pointers to remove the depenancy cross dependancy on nfs4Alfred Perlstein2003-11-221-4/+0
| | | | | | | | | | | and the nfs3 client. Also fix some bugs that happen to be causing crashes in both v3 and v4 introduced by the v4 import. Submitted by: Jim Rees <rees@umich.edu> Approved by: re Notes: svn path=/head/; revision=122953
* University of Michigan's Citi NFSv4 kernel client code.Alfred Perlstein2003-11-141-0/+6
| | | | | | | Submitted by: Jim Rees <rees@umich.edu> Notes: svn path=/head/; revision=122698
* Remove mntvnode_mtx and replace it with per-mountpoint mutex.Alexander Kabaev2003-11-051-4/+4
| | | | | | | | | | | | | Introduce two new macros MNT_ILOCK(mp)/MNT_IUNLOCK(mp) to operate on this mutex transparently. Eventually new mutex will be protecting more fields in struct mount, not only vnode list. Discussed with: jeff Notes: svn path=/head/; revision=122091
* - Check the XLOCK before we inspect the vnode.Jeff Roberson2003-10-051-0/+4
| | | | Notes: svn path=/head/; revision=120787
* Name the vnode method vectors consistently with the rest of the filesystems.Poul-Henning Kamp2003-09-121-2/+2
| | | | | | | This improves the output of src/tools/tools/vop_table Notes: svn path=/head/; revision=120003
* Back out M_* changes, per decision of the TRB.Warner Losh2003-02-191-11/+11
| | | | | | | Approved by: trb Notes: svn path=/head/; revision=111119
* Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.Alfred Perlstein2003-01-211-11/+11
| | | | | | | Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT. Notes: svn path=/head/; revision=109623
* Change iov_base's type from `char *' to the standard `void *'. AllMike Barcroft2002-10-111-1/+2
| | | | | | | | uses of iov_base which assume its type is `char *' (in order to do pointer arithmetic) have been updated to cast iov_base to `char *'. Notes: svn path=/head/; revision=104908
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